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A predictive model unifying hydrogen enhanced plasticity and decohesion

Abstract

The detrimental effect of hydrogen on metals which manifests itself as a transition from a ductile to a brittle failure mode is, for the first time, incorporated into a unified continuum-scale predictive framework. The complete Gurson model, designed to predict ductile failure by voiding, is extended to include failure by decohesion. Hydrogen enhanced plasticity is accounted for through acceleration of the voiding process while hydrogen induced decohesion is realized by a degradation of the decohesion threshold. The interplay between these two failure modes driven by hydrogen concentration are well captured. This model can predict a realistic level of embrittlement as well as the suppression of dimples in a hydrogen induced fracture surface. Being generic, versatile, and easy to implement, the model may serve as a basis for interpretation of laboratory experiments and enable the transferability of the laboratory results to the integrity assessment of engineering components in hydrogen environment.

Category

Academic article

Client

  • Research Council of Norway (RCN) / 294689
  • Research Council of Norway (RCN) / 294739

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • Uppsala University
  • Zhengzhou University
  • SINTEF Industry / Materials and Nanotechnology

Year

2022

Published in

Scripta Materialia

ISSN

1359-6462

Volume

215

Page(s)

1 - 6

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